The Liver is the Only Organ That Can Regenerate
Regeneration is a pretty cool biological process. Unfortunately, it’s not a common phenomenon amongst humans. Reptiles such as lizards can regrow limbs if they lose them. That would have come in handy for humans. Thankfully, we aren’t too far down on the regeneration scale.
The liver can regenerate back to its full size even if more than half of it is original mass. Unlike other organs, a scar replaces tissue in the liver. The liver has the ability to regenerate due to central liver homeostasis.